Internal Gear Pump
f
or low−viscosity fluids
Series QXV
1 General
1.1 Product description
S Very low noise levels
S Negligible pressure pulsations
S To 250 bar can be developed at viscosities around
1 mm2/s (cSt)
S Multi−stage principle ensures low pressure loading
on each stage, giving outstanding efficiencies
S Hydrodynamic bearing support ensures long ser-
vice life
S Used successfully to pump kerosene, diesel fuel,
brake fluids, Pentosin and HFA.
The QXV unit is an internal gear pump for low−viscosity
fluids. By using several pump stages connected in series,
pressures to 250 bar can be developed with high efficiency
at viscosities of around 1 mm2/s . The QXV is being used
with great success to pump aviation jet fuel, automotive
fuels, paraffin oil/kerosene, brake fluids, Pentosin and HFA
fluids. Dependent on the requirements of the application, up
to five pump stages can be connected in series. The unit is
based on the well−known QX internal gear pump, which is
distinguished by its very low noise levels and al−most imperceptible pressure pulsations. The large number of closely
spaced sizes ensures that the right size is always available
for every application.
1.2 Application examples
S Test rigs for diesel injection nozzles
S Test rigs for testing Jet A1/fuel controllers for air-
craft turbines
S Rolling mills
S Fuel pumps for gasturbines
S Welding machines
S Inbrication pump for spindle bearings
2 Technical data
General characteristics Description, value, unit
Installation attitude unrestricted
Mounting method (standard) oval 2−hole flange to ISO 3019/1 (SAE): QXM 3−6
oval 2−hole flange to ISO 3019/2
Direction of rotation right, alternatively left (but not reversible)
Pump drive method flexible shaft coupling
(metric) QXM 2+8
Min. fluid cleanliness level NAS 1638, class 8 or ISO 4406, code 19/17/14
Viscosity range 0,8...10 mm2/s
(for values outside this range, consult Bucher Hydraulics)
Fluid temperature
(Observe viscosity limits for respective fluids)
Minimum inlet pressure 0,85 − 1 bar absolute (dependent on pump size and speed.
Maximum pressure at drain port < 1,5 bar absolute
Issue: 03.11
min. −20°C, max. +80°C
HFA ... +50°C max.
Optimal range: +30°C +60°C
Beyond these values please contact Bucher Hydraulics)
Reference: 100−P−000064−E−02
1/8
2.1 Main characteristics
Pressure range 1 2 3 4 5 6 1 2−6
/rev
3)
25 50 100 150 200 250
Type Type Type Type Type Type
Oper. pressure
bar
Displacement
3
cm
5,1 QXV 22−005 QXV 23−005 QXV 24−005 QXV 25−005 QXV 26−005
6,3 QXV 22−006 QXV 23−006 QXV 24−006 QXV 25−006 QXV 26−006
8,0 QXV 22−008 QXV 23−008 QXV 24−008 QXV 25−008 QXV 26−008
10,0 QXV 21−010 QXV 32−010 QXV 33−010 QXV 34−010 QXV 35−010 QXV 36−010
12,6 QXV 21−012 QXV 32−012 QXV 33−012 QXV 34−012 QXV 35−012 QXV 36−012
15,6 QXV 21−016 QXV 32−016 QXV 33−016 QXV 34−016 QXV 35−016 QXV 36−016
20,4 QXV 31−020 QXV 42−020 QXV 43−020 QXV 44−020 QXV 45−020 QXV 46−020
25,1 QXV 31−025 QXV 42−025 QXV 43−025 QXV 44−025 QXV 45−025 QXV 46−025
32,4 QXV 31−032 QXV 42−032 QXV 43−032 QXV 44−032 QXV 45−032 QXV 46−032
39,3 QXV 41−040 QXV 52−040 QXV 53−040 QXV 54−040 QXV 55−040 QXV 56−040
50,6 QXV 41−050 QXV 52−050 QXV 53−050 QXV 54−050 QXV 55−050 QXV 56−050
63,7 QXV 41−063 QXV 52−063 QXV 53−063 QXV 54−063 QXV 55−063 QXV 56−063
Speed range
1)
rpm
3000
−
3600
3000
3600
1800
3000
1500
1800
3000
−
−
3600
3000
−
−
3600
1800
−
−
3000
80,2 QXV 51−080 QXV 62−080 QXV 63−080 QXV 64−080 QXV 65−080 QXV 66−080
101,0 QXV 51−100 QXV 62−100 QXV 63−100 QXV 64−100 QXV 65−100 QXV 66−100
124,4 QXV 51−125 QXV 62−125 QXV 63−125 QXV 64−125 QXV 65−125 QXV 66−125
163,0 QXV 61−160 QXV 82−160 QXV 83−160 QXV 84−160 QXV 85−160 QXV 86−160
201,3 QXV 61−200 QXV 82−200 QXV 83−200 QXV 84−200 QXV 85−200 QXV 86−200 1200
249,2 QXV 61−2502)QXV 82−250 QXV 83−250 QXV 84−250 QXV 85−250 QXV 86−250
326,0 QXV 81−315
402,6 QXV 81−400
498,5 QXV 81−500
1) Recommended speeds:
• The lower the speed, the smaller the ΔP/stage (linear relationship)
• Speeds for 50 and 60 Hz
2) Second suction port is necessary for n > 1200 rpm (see section 5.3, Special features)
3) Do not run up pump against pressures higher than 20 bar
If you use these pumps with viscosity < 2,5 cSt, you must order option 360 or 360−2
Option 360 = Pumps size 5, 6 and 8, with metric mounting flange
Option 360−2 = Pumps size 5 and 6, pressure range 2 − 6, with SAE mounting flange
2)
2)
2)
1500
−
1800
1200
−
1500
1200
−
1500
1500
−
1800
1200 −
1800
−
1500
2/8
100−P−000064−E−02 /03.11
Internal Gear Pump QXV
3 Performance graphs
Measured at a viscosity of 2.3 mm2/s (cSt)
3.1 Pressure range 1
3.1.1 Volumetric efficiency
η [%]
100
95
90
85
0
1 QXV21, 3000 min
2 QXV31, 3000 min
QXV41, 1800 min
3
−1
4
−1
5
−1
6
3.2 Pressure range 2
3.2.1 Volumetric efficiency
η
[%]
vol.
100
95
90
85
80
75
70
0
1 QXV52, 3000 min
2 QXV82, 1800 min
QXV62, 1800 min
3
−1
4
−1
5
−1
6
2015105
QXV51, 1800 min
QXV61, 1500 min
QXV81, 1500 min
2
40302010
QXV42, 3000 min
QXV32, 3000 min
QXV22, 3000 min
p [bar]
−1
−1
−1
3
p [bar]
−1
−1
−1
3.1.2 Hydro−mechanical efficiency
η [%]
90
1
2
1
2
3
4
5
6
85
80
75
70
0
1 QXV81, 1500 min
2 QXV61, 1500 min
QXV51, 1800 min
3
105
−1
−1
−1
15
QXV41, 1800 min
4
QXV21, 3000 min
5
QXV31, 3000 min
6
20
3
4
5
6
p [bar]
−1
−1
−1
3.2.2 Hydro−mechanical efficiency
ηhm [%]
95
1
4
5
6
90
85
80
75
70
0
10
1 QXV62, 1800 min
2 QXV42, 3000 min
QXV52, 3000 min
3
20
−1
−1
−1
30
QXV32, 3000 min
4
QXV22, 3000 min
5
QXV82, 1800 min
6
3
40
2
5
p [bar]
−1
−1
−1
1
4
6
3.3 Pressure range 3
3.3.1 Volumetric efficiency
[%]
η
vol.
100
95
90
85
80
75
70
0
1 QXV53, 3000 min
2 QXV83, 1800 min
QXV43, 3000 min
3
100−P−000064−E−02 /03.11
Internal Gear Pump QXV
−1
4
−1
5
−1
6
80604020
QXV63, 1800 min
QXV33, 3000 min
QXV23, 3000 min
2
p [bar]
−1
−1
−1
3.3.2 Hydro−mechanical efficiency
ηhm [%]
100
95
1
3
4
5
6
90
85
80
75
0
QXV63, 1800 min
1
QXV53, 3000 min
2
QXV43, 3000 min
3
−1
−1
−1
QXV33, 3000 min
4
QXV23, 3000 min
5
QXV83, 1800 min
6
3
80604020
4
p [bar]
−1
−1
−1
1
2
5
6
3/8
3.4 Pressure range 4
3.4.1 Volumetric efficiency
η
[%]
vol.
100
95
90
85
80
75
0
3.4.2 Hydro−mechanical efficiency
ηhm [% ]
95
90
1
2
3
4
5
6
p [bar]
125100755025
85
80
75
70
0 125100755025
6
1
2
3
4
5
p [bar]
QXV54, 3000 min
1
QXV44, 3600 min
2
QXV84, 1800 min
3
−1
4
−1
5
−1
6
3.5 Pressure range 5
3.5.1 Volumetric efficiency
[%]
η
vol.
100
95
90
85
80
75
0
1 QXV55, 3000 min
2 QXV45, 3000 min
3 QXV85, 1800 min
−1
4 QXV65, 1800 min
−1
5 QXV35, 3000 min
−1
6 QXV25, 3000 min
3.6 Pressure range 6
3.6.1 Volumetric efficiency
η
[%]
vol.
100
95
90
85
80
75
0
QXV64, 1800 min
QXV34, 3000 min
QXV24, 3000 min
15010050
3
20015010050
−1
−1
−1
2
4
p [bar]
−1
−1
−1
4
p [bar]
QXV64, 1800 min
1
QXV24, 3000 min
2
QXV34, 3000 min
3
−1
−1
−1
QXV44, 3000 min
4
QXV54, 3000 min
5
QXV84, 1800 min
6
−1
−1
−1
3.5.2 Hydro−mechanical efficiency
[% ]
η
hm
95
90
1
3
5
6
85
80
75
70
0
1 QXV65, 1800 min
−1
4 QXV45, 3000 min
6
15010050
2 QXV25, 3000 min−15 QXV55, 3000 min
3 QXV35, 3000 min−16 QXV85, 1800 min
3
2
5
p [bar]
−1
−1
−1
1
4
3.6.2 Hydro−mechanical efficiency
η
[%]
vol.
100
95
1
2
5
6
90
85
80
75
0
4
20015010050
3
5
p [bar]
1
2
6
1 QXV56, 3000 min
2 QXV46, 3600 min
3 QXV86, 1800 min
4/8
−1
4 QXV66, 1800 min
−1
5 QXV36, 3000 min
−1
6 QXV26, 3000 min
−1
−1
−1
1 QXV56, 3000 min
2 QXV46, 3600 min
3 QXV86, 1800 min
−1
4 QXV66, 1800 min
−1
5 QXV36, 3000 min
−1
6 QXV26, 3000 min
−1
−1
−1
100−P−000064−E−02 /03.11
Internal Gear Pump QXV
4 Dimensions
4.1 Pressure ranges 1 / 2 / 3
Frame size 2 3 4 5 6 8
Presure range 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3
Suction port:
to standard
Pressure port:
to standard
S
P
Drain port R G 1/4" G 1/4" G 1/4" G 1/4" G 3/8" G 1/2"
Mounting:
oval 2−hole
flange to
ISO 3019/1
(SAE)
ISO 3019/2
(metric)
A 118 132 170 212 267 330
B
(SAE)
B (Metr.) 100 109 140 180 224 280
C 9 11 14 18 22 26
N
(SAE)
N
(Metr.)
O 8,5 8,5 10,5 12,5 16,5 20
V 6 6 7 7 7 9
Shaft end:
parallel, to
ISO/R775
1)
D 20 j6 25 j6 32 j6 40 j6 50 j6 63 j6
E 36 42 58 82 82 105
F 6 8 10 12 14 18
G 22,5 28 35 43 53,5 67
I 45 50 68 92 92 11 7
Housing K 37,5 44 52,5 60,5 74 90
L 140 122 157 166 146 191 204 178 234 244 212 282 289 249 339 364 314 429
M − 55 90 − 69,5 114,5 − 87 143 − 102 172 − 119 209 − 151 266
T 86 107 133 177 214 220 273 275
Z 50 60 62,5 78 97,5 125
Weight kg 5 5 6,5 10 9,5 12,5 18 17 22 33 31 40 64 60 76 130 120 160
1) For other shaft ends, consult Bucher Hydraulics
2) Pressure port to SAE J518 can be supplied for pressure ranges 2+3
G1"
DIN 3852 / 2
2)
G1/2"
DIN 3852 / 2
G1 1/4"
DIN 3852 / 2
2)
G3/4"
DIN 3852 / 2
1 1/2"
SAE J518
1"
SAE J518
2"
SAE J518
1 1/4"
SAE J518
2 1/2"
SAE J518
1 1/2"
SAE J518
− 106 146 181 229 −
− 82,55 − 0,05 101,6 − 0,05 127 − 0,05 152,4 − 0,05 −
63 h8 80 h8 100 h8 125 h8 160 h8 200 h8
3"
SAE J518
2"
SAE J518
4.1.1 Pressure range 1
L
KI
E
S
G
D
N
V
P
O
4.1.3 Pressure range 3
L
I
K
E
D
G
N
V
100−P−000064−E−02 /03.11
Internal Gear Pump QXV
M
S
O
4.1.2 Pressure range 2
L
M
KI
S
C
A
A
F
ZZ
C
F
Z
B
B
Z
N
G
T
R
P
T
R
E
D
V
O
P
T
R
A
C
F
B
ZZ
5/8
4.2 Pressure ranges 4 / 5 / 6
Frame size 2 3 4 5 6 8
Pressure range 4 5 6 4 5 6 4 5 6 4 5 6 4 5 6 4 5 6
Suction port:
to standard
Pressure port:
to standard
S
P
Drain port R G 1/4" G 1/4" G 1/4" G 1/4" G 3/8" G 1/2"
Mounting:
oval 2−hole
flange to
ISO 3019/1
(SAE)
ISO 3019/2
(metric)
A 118 132 170 212 267 330
B
(SAE)
B (Metr.) 100 109 140 180 224 280
C 9 11 14 18 22 26
N
(SAE)
N
(Metr.)
O 8,5 8,5 10,5 12,5 16,5 20
V 6 6 7 7 7 9
Shaft end:
parallel, to
ISO/R775
1)
D 20 j6 25 j6 32 j6 40 j6 50 j6 63 j6
E 36 42 58 82 82 105
F 6 8 10 12 14 18
G 22,5 28 35 43 53,5 67
I 45 50 68 92 92 117
Housing K 37,5 44 52,5 60,5 74 90
L 192 227 262 236 281 326 290 346 402 352 422 492 429 519 609 544 659 774
M 125 160 195 159,5 204,5 249,5 199 255 311 242 312 382 299 389 479 381 496 611
T 86 107 133 177 220 273 275
Z 50 60 62,5 78 97,5 125
Weight kg 8 9,5 11 15,5 18,5 21,5 27 32 37 49 58 67 92 108 124 200 240 280
G1"
DIN 3852 / 2
2)
G1/2"
DIN 3852 / 2
G1 1/4"
DIN 3852 / 2
2)
G3/4"
DIN 3852 / 2
1 1/2"
SAE J518
1"
SAE J518
2"
SAE J518
1 1/4"
SAE J518
2 1/2"
SAE J518
1 1/2"
SAE J518
− 106 146 181 229 −
− 82,55 − 0,05 101,6 − 0,05 127 − 0,05 152,4 − 0,05 −
63 h8 80 h8 100 h8 125 h8 160 h8 200 h8
3"
SAE J518
2"
SAE J518
1) For other shaft ends, consult Bucher Hydraulics
2) Pressure port to SAE J518 can be supplied for pressure ranges 2+3
4.2.1 Pressure range 4
L
KMI
E
N
G
D
V
S
O
T
R
P
A
C
F
B
ZZ
4.2.3 Pressure range 6
L
K
I
E
D
N
G
V
O
M
C
T
S
P
R
F
A
Z
Z
4.2.2 Pressure range 5
L
I
KM
A
C
F
B
ZZ
E
N
D
G
V
S
O
B
T
R
P
6/8
100−P−000064−E−02 /03.11
Internal Gear Pump QXV
5 Ordering code
Series: internal gear pumps for low−viscosity fluids QXV
Frame size 2 / 3 / 4 / 5 / 6 / 8
Pressure range 1 / 2 / 3 / 4 / 5 / 6
R3012**6QXV − *
Geom. displacement in cm
Direction of rotation right = R
Option − see section 5.3 for a selection
3
/rev 005 − 500
left = L
5.1 Ordering example
Required: internal gear pump, type QXV
Displacement: 12 cm3/rev
Continuous pressure 250 bar
For use with diesel fuel oil.
Ordering code: QXV 36−012 R
5.2 Standard configuration
S Direction of rotation − right, alternatively left
S 2−hole mounting flange to ISO 3019/1 (SAE): sizes QXV 3−6
2−hole mounting flange to ISO 3019/2 (metric): sizes QXV 2+8
S Viton seals
S Cylindrical shaft end to ISO R775
S External drain port R in pump end cover
5.3 Option
12 2−hole mounting flange to ISO 3019/2 (metric) for frame sizes QXV 3−6
83 Second suction port on QXV 61, size SAE 2"
Second suction port on QXV 81, size SAE 2 1/2"
179 For applications with higher fluid temperatures − maximum 160_C
360 For application with viscosity < 2,5 mm
360−2 For application with viscosity < 2,5 mm2/s (cSt). Pumps size 5 and 6, pressure range 2 − 6, with SAE mounting flange
For other options, consult Bucher Hydraulics
100−P−000064−E−02 /03.11
Internal Gear Pump QXV
2
/s (cSt). Pumps size 5, 6 and 8, with metric mounting flange
7/8
6 Recommendations for use
S Good filtration is extremely important with low viscosity
fluids. Maximum fluid cleanliness 19/17/14 of ISO4406.
Level of NAS 1638, class 8
S Only use QXV pumps within the specified speed range.
S We recommend that the fluid level in the reservoir should
be above the centre line of the pump
S Pumps must be driven by means of a flexible coupling
S The temperature difference between a pump and the fluid
entering it must not exceed 20 _C
S Before the initial start−up, fill the pump by hand (via the
drain line). When starting the system for the first time,
switch to vented−bypass mode so that the pump and hydraulic lines can fill, and air can escape, as quickly as possible. Do not build up pressure until all air has been purged from the system.
S Attention: check the motor’s direction of rotation!
S For details, see Operating Manual 100−I−000014
S When running the pump under pressure for the first time,
use the running−in cycle shown below.
7 QXV internal gear pumps − running−in cycle for the first operation
under pressure
3s
2s
1s
100
3s
2s
1s
3s
2s
50
1s
240s
240s
240s
0
working pressure in %
280s
2 4 6 8 10 12 14 16 18 20 22 min.
2s
1s
Running in time = 21 min
20s
3s
2s
30s
14s
3s3s5s
www.bucherhydraulics.cominfo.kl@bucherhydraulics.com
E 2011 by Bucher Hydraulics GmbH, D−79771 Klettgau
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense.
The information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to
continual improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 410.100.
8/8
100−P−000064−E−02 /03.11
Internal Gear Pump QXV
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